MKVToolnix is a video editing and conversion tool for the Matroska format, better known to most users as ‘MKV’. Video conversions can be carried out on a huge number of different formats, both video and audio and subtitles. Thus, we can load into our projects any file in Avi, Wmv, Ogg, Srt, Mp3, Mp4, Rmv or Usf, among many others.
This means that for our conversions and editions we can use both videos, which will be the basic tool, as well as audio or subtitle files, which we can add to the final result in a fairly simple way.
MKVToolnix is a tool aimed at users experienced in video editing and conversion, since its large number of options, although not particularly complex, can overwhelm many users.